distinguish normal and animated gif

[trexx]

does anyone know a simple method to distinguish between them?

GD-Lib doesn't make a difference between them. Image Magick tells me that animated gifs are broken gifs. So what else can i do? read the GIF spec? parse the GIF-Source?

Hope there's an easier way 😃

[trexx]

for those who have the same problem some time, i've found the solution after reading some specs... my function does not completely analyze the gif source, so there is a (very small) chance, that a animated gif isn't recognized correctly.

/**
	 * Function isAnimatedGif.
	 */
	function isAnimatedGif( $file )
	{
		$isAniGif = false;

	$gif = Util::getFileAsString( $file );
    $header = strtolower( substr($gif, 0, 6) );
	if( $header == 'gif89a' && 
		(stristr($gif, 'netscape2.0') || stristr($gif, 'animexts1.0')) )
			$isAniGif = true;

	return $isAniGif;
}